TM 5-3895-382-24 Do not disassemble the fuel injector nozzles and do not adjust the fuel injector nozzles on the following engines: Type 2 Engines and 7BJ Engines Replace  the  fuel  injector  nozzle  on  Type  2  engines  and  7BJ engines  if  the  fuel  injector  nozzle  does  not  operate  correctly. These fuel injector nozzles are not serviceable parts. Problem 1 Back Leakage Probable Cause 1. Fuel leaks through the cap nut or the retaining nut. Make sure that the threads are clean.  Tighten the nuts to the correct torque. 2. Debris  or  damage  exists  on  the  needle  valve  or  the body. Visually inspect the needle and the body of the valve for carbon pitting, scoring, or other damage. Problem 2 The fuel injector nozzle does not inject fuel in the correct quantity or in the correct pattern. Probable Cause 1. The setting of the opening pressure is incorrect. Test  the  setting  of  the  opening  pressure.    Adjust  the setting to the correct pressure. 2. The fuel injector nozzle is stuck. Debris or damage exists on the fuel injector nozzle. 3. The orifices are blocked. Inspect the orifices for carbon buildup.  The fuel injector nozzle must be cleaned or replaced. 4. The spring is damaged. Replace the spring or the fuel injector nozzle. 5. The  needle  valve  or  the  body  is  damaged.    The  fuel injector   nozzle   makes   a   noise   which   is   caused   by vibration when the fuel is injected. Visually   inspect   the   needle   valve   and   the   body   for carbon pitting, scoring, or other damage. 6. The passage for the fuel return is obstructed. Clean   the   passage   in   order   to   remove   any   carbon buildup or other debris. 7. The cap nut is too tight. Adjust the cap nut to the correct torque. Troubleshooting The Turbocharger Problem 1 Not Enough Power Probable Cause 1. The element of the air filter is dirty. The element must be cleaned or replaced. 2. A restriction exists in the tube between the air filter and the turbocharger. 3. An air leak or a restriction exists in the line between the turbocharger and the intake manifold. The component must be repaired or replaced. 4. A restriction exists in the exhaust system. The component must be repaired or replaced. 5. The  turbocharger  is  loose  or  the  clamps  and  bolts  on the turbocharger are loose. Correctly   position   the   turbocharger   and   tighten   the clamps and bolts. 6. The  intake  manifold  is  cracked,  loose  or  the  flange  is distorted. The intake manifold must be repaired or replaced. 7. The exhaust manifold is cracked, loose, or the flange is distorted. The exhaust manifold must be repaired or replaced. 8. The turbine housing is damaged or restricted. The turbine housing must be repaired or replaced. 9. The bearings of the turbocharger are worn. Replace the bearings. 10. Excessive dirt exists in the compressor housing. Clean the compressor housing. 6-28